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• Create silent wav and pipe it

  2 avril 2021, par Ícaro Erasmo

  I've been through many stackoverflow pages and forums trying to find the answer I want.
I created a virtual microphone and I'm trying to pipe to it some wav sounds created using FFMPEG.

  


  When I want to pipe a keyboard noise I pipe the sound to my virtual sound capture device like this :

  


  ffmpeg -fflags &#x2B;discardcorrupt -i <keyboard sound="sound" path="path"> -f s16le -ar 44100 -ac 1 - > /tmp/gapFakeMic&#xA;</keyboard>

  


  And when I want to pipe some synthetized voice sound using Espeak to my virtual microphone, I do this :

  


  espeak -vbrazil-mbrola-4 <some random="random" text="text"> --stdout | ffmpeg -fflags &#x2B;discardcorrupt -i pipe:0 -f s16le -ar 44100 -ac 1 - > /tmp/gapFakeMic&#xA;</some>

  


  The problem is my capture device doesn't record the sound like a normal recorder that still records even when there's no sound being transmited to it. So I'm trying to append the silence to the wav which is being created while my application is running. Always when I try to send the silence to buffer, FFMPEG returns the following response :

  


  [NULL @ 0x5579f7921a00] Unable to find a suitable output format for 'pipe:'


  


  FFMPEG is a powerful tool but its documentation lacks to be useful for newbies like me. So, I'd appreciate if anyone could answer this or at least give me any direction or some resource where I could find a way of achieving this.

  


  EDIT :

  


  Here's how I'm producing the silence to my virtual microphone :

  


  ffmpeg -f lavfi -i anullsrc=channel_layout=mono:sample_rate=44100 -t <time in="in" seconds="seconds"> - > /tmp/gapFakeMic&#xA;</time>

  


  Here's the full log :

  


  ffmpeg version 4.1.6-1~deb10u1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --prefix=/usr --extra-version='1~deb10u1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared

  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100

Input #0, lavfi, from 'anullsrc=channel_layout=mono:sample_rate=44100':
  Duration: N/A, start: 0.000000, bitrate: 352 kb/s
    Stream #0:0: Audio: pcm_u8, 44100 Hz, mono, u8, 352 kb/s

[NULL @ 0x560516626f40] Unable to find a suitable output format for 'pipe:'
pipe:: Invalid argument


  


  EDIT 2 :

  


  After Gyan provided a solution in the comments the error above doesn't show anymore but my result audio is being broken and doesn't come out as expected. Now the command that generates and appends the silent audio is like this :

  


  ffmpeg -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -t <time in="in" seconds="seconds"> -f s16le - > /tmp/gapFakeMic&#xA;</time>

  


  Edit 3 :

  


  I've made some changes to the command I'm using to pipe silence to the virtual mic. I think the pipe is breaking because of some incompatibility in audio formats. I hope I can find a solution in the next few days. After every little change I realize some improvements. Now I can hear the silence between the keys sounds but it isn't recording all the audios I'm passing to it. Here's how the command is now :

  


  ffmpeg -f lavfi -i anullsrc=channel_layout=mono:sample_rate=44100 -t <time in="in" seconds="seconds"> -f s16le -ar 44100 -ac 1 - > /home/icaroerasmo/gapFakeMic`&#xA;</time>

  


  I also realized that when I pipe the sound to a pipe file created inside my home folder the audio quality improves.

  


  Edit 4 :

  


  After all this struggle it's clear now that the named pipe is breaking in the second time it's called. I've already googled how to flush a named pipe but I didn't find anything that worked.

  


• Community survey revealed – Discover the profile of a Piwik user

  7 novembre 2017, par Piwik Core Team — Community

  In January 2017 we launched a Piwik community survey which gathered more than a thousand responses. It is now time for us to release the results of this study. We release today the results of this survey painting a picture of the growing Piwik Analytics community !

  What types of businesses are using Piwik ?

  Just a reminder : Piwik is currently used on over 1 million websites and mobile apps.

  

  According to the community survey, 75% of businesses using Piwik are small companies and 25% are medium to large enterprises. Out of those 25%, more than 7% are large enterprises with more than a 1,000 of employees.

  Why choosing Piwik ?

  With a large majority, Open Source came first with almost 50% of the answers, then come the data security aspect (27%) in third comes the raw data access (10,5%) and for a minor part customizability with 1,9%.

  How often is Piwik used ?

  92% of respondents said that they are using Piwik regularly (at least once per month) :

  • on a daily basis 28%
  • on a weekly basis 41%
  • on a monthly basis 23%

  Is Piwik mostly installed on Intranet or External websites ?

  

  Piwik is mainly installed on external websites, 80% of the cases. However, 12% of respondents answer that they are using it on intranet too. The remaining 8% have chosen not to answer.

  Which CRM for Piwik users ?

  As CRM is a high valuable asset within the company, we wanted to check if there were any needs for Piwik to develop something specifically for CRM.
  The answers showed us that in almost 60% of the cases no CRM was used at all, for the rest there is no clear leading CRM which is used more than others.

  Do Piwik users wish more integrations to third party applications such as CRM, support systems ?

  60% of responders said no, which can clearly be understood from previous question. But the 40% remaining are clearly showing that they wish more integrations. We heard you, we are constantly updating our integration page. If there are any integrations you wish to have, do not hesitate to contact the solution provider and suggest them to integrate their product with Piwik.

  How do Piwik users get notified when a KPI reach a specific value ?

  Great question, great answers. Almost 50% of responders are not notified when something happens in Piwik and prefer to have a look at the UI instead. 15% did not know that it was possible using Custom Alerts but may have a look it. Some of you are also designing their own system. It made us realize here that we need to change our UI and integrate custom alerts to the main UI directly. Custom alerts is a great feature that you can access within the administration panel to get notified when something happened in your Piwik data.

  

  Which improvements could be made to Piwik ?

  Only 20% of you answered to this question, which is a good thing for us

• avformat/mp3dec : Require probing data to be 50% mp3 frames for low score probing...

  12 mai 2018, par Michael Niedermayer

  avformat/mp3dec : Require probing data to be 50% mp3 frames for low score probing to succeed
  This massively reduces the detection of random data as low score mp3
  
  It may improve security by making it harder to read non multimedia data
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/mp3dec.c